Observational Problems in Extragalactic Astronomy
نویسندگان
چکیده
منابع مشابه
Extragalactic Stellar Astronomy
Despite their paucity, massive hot stars are real cosmic engines of fundamental importance in shaping our Universe, from its very early stages up to its current appearance. Understanding the physics of massive stars is then a key issue for many relevant astrophysical phenomena. Their spectra provide constraints required for stellar and galactic evolution calculations, such as mass-loss rates, d...
متن کاملMultivariate approaches to classification in extragalactic astronomy
Clustering objects into synthetic groups is a natural activity of any science. Astrophysics is not an exception and is now facing a deluge of data. For galaxies, the one-century old Hubble classification and the Hubble tuning fork are still largely in use, together with numerous monoor bivariate classifications most often made by eye. However, a classification must be driven by the data, and so...
متن کاملThe Long–Term Future of Extragalactic Astronomy
If the current energy density of the universe is indeed dominated by a cosmological constant, then high–redshift sources will remain visible to us only until they reach some finite age in their rest–frame. The radiation emitted beyond that age will never reach us due to the acceleration of the cosmic expansion rate, and so we will never know what these sources look like as they become older. As...
متن کاملExtragalactic Stellar Astronomy with the Brightest Stars in the Universe
A supergiants are objects in transition from the blue to the red (and vice versa) in the uppermost HRD. They are the intrinsically brightest ”normal” stars at visual light with absolute visual magnitudes up to -9. They are ideal to study young stellar populations in galaxies beyond the Local Group to determine chemical composition and evolution, interstellar extinction, reddening laws and dista...
متن کاملBook review: “Extragalactic astronomy and cosmology—an introduction”
Citation: Cappi A (2015) Book review: " Extragalactic astronomy and cosmology—an introduction. "
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Highlights of Astronomy
سال: 1992
ISSN: 1539-2996
DOI: 10.1017/s153929960000873x